<template>
    
</template>
<script>
console.log("变量提升",a);
var a = 23;

console.log(b());
function b(){
    console.log("函数提升")
}

// console.log(c());//: c is not a function 变量提升表示值为undefined
var c = function(){
    console.log("声明式函数提升")
}
</script>